Beyond its exterior, the 126598 is powered by the , a self-winding mechanical chronograph movement. This updated movement offers several enhancements over its predecessor, the 4130:
: Certain rare variants, such as the "126598 TRU," feature exotic stones like "pigeon blood" rubies on the bezel, making them highly sought-after "off-catalog" releases. Technical Prowess: Calibre 4131 126598
: The movement is regulated to an impressive accuracy of -2/+2 seconds per day . Beyond its exterior, the 126598 is powered by